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The most basic C4D Multipass Q'tn Ever!

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  • In case you're following and would like a summary, here's what I've discovered:
    C4d R19.068 At least

    I'm dealing with animation. Your mileage with still images may vary.



    Until new Multipass options were added in C4D R20, it was never possible to re-assemble an accurate beauty pass from C4D prior to this, see the link earlier in this thread, explicitly noted.


    - Multipass check box active will *change your main beauty render*, especially if outputting 32 bit files (as you need to) as you will immediately be rendering in Linear Color Space, not sRGB or whatever you might have set if you have set something. Simply checking Multipass will change even your image render, whether you select specific multipasses or not, if you are using Post Effects, and maybe if not also... It's a real Pandora's Box on your scene. Renders without Multipass checked and with it checked can look very different due to Colorspace assignments in the renders.

    - To composite Multipasses you really need 32 bit files. Choosing 16 bit EXR or PNG/TIFF etc. will create freaky passes and unpredictable composites, depending on your lighting and other settings. You will also suffer headroom problems in the composite and get grainy weirdness. Use 32 bit.

    - No formats that can't work in Linear will give good results, or even any results (Quicktime, AVI, etc.)

    Image sequences only, and think about that 32 bit format if you want fidelity.


    - Lights that are reproduced in cloners will require making the cloner into an editable object and creating individual lights if you wish the intensity of your lights to be interpolated correctly by the renderer. Cloned lights will not render correctly if you have adjusted intensity settings (and maybe if you haven't, I'd check if I were you). This is since R18 and still not fixed as far as I can tell.


    - Glow is a b'stard. Most especially, in the composite file created for After Effects if you use that render setting in C4D, it gets positioned beneath a Multiply layer on any motion blur you might have set, and this makes it dramatically alter the lighting in your scene. You need to move it above that Multiply Motion Blur layer to get an accurate composite of the render you see in Image View in C4D (and maybe play with opacity a little in your  compositor). Depending on the nature of your Glow (this is Advanced Render Glow, not Glow as a channel in a Texture, btw) you will really struggle to reproduce the lighting interaction in the Glow with other lights that render in your Image View render, from the scene in your Multipass. I fought this a lot, and found no solution. The Multipass composite is just gonna look a bit less 'popping', and not hit any noise in your lights the way it does when you render straight to sRGB.

    - Lens effects need a ******* insane Curves adjustment in After Effects to get anything like the result you'll see if you uncheck Multipass and let the renderer work in sRGB in C4D. It looks pretty great (ie close to the beauty pass), but scares you if you are aware of what it's doing in the maths. *Shrug*. The Glow pass can also do with a crazy Curves boost, and backing off on the Opacity if needed, but even this won't get the same 'blooming' and cool glows that appear in Volumetric lights interacting with the GLow in a straight sRGB pass without using Multipass in C4D. It's pretty weird, but there it is.

    - I really need to understand 'Linear Work Flow' better to grok what the fudge is going on with Multipass Rendering in C4D.

    - On the other hand, I'm gonna go fully over to Redshift, and get frustrated with that instead :)

    PEACE :129fs238648:

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    1 hour ago, Ogunzinho said:

    Chris Schmidt, from GreyScaleGorilla adds...

    He left GSG a fair while back. He runs Rocket Lasso now, and so his excellent Screencasts have resumed on Wednesdays in case you didn't know...


    I'll be following you over to Redshift Corner when I've got enough £££ to build myself the sort of system that can run it :)



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  • Topic Author
  • I didn't know, but just signed up to Rocket Lasso - thanks!

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